Your phone can be repaired by formatting (soft/hard)For hard formatting as your phone is unable to start,Keep pressing 'Green', ' * ', and ' 3 ' keys and start the phone.Keep all the buttons pressed till the phone says "Formatting"The phone formats, starts, and all the data is lost.But the phone is all OK as before.

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Press the " *, Green, 3 " it boots the phone like normal.
You can make phone call and everything.
(it actually BYPASS "contact retailer" screen)

But when it auto shuts down or low in battery.
when you switch it on again.
It comes back to the screen
"Phone start-up failed"
"please contact retailer"So the above mentioned is the temporary solution. For permanent one please contact customer service center.

hi,Your phone's memory card must be infected with virus or has some fault. Please remove the memory card and try to start the phone again. If it goes through, please back up the data in your memory card and format it. In most cases, this procedure solves the "Phone start up failed. Contact the retailer" error.I'd advice you to format your phones internal memory as well, it will flush out any errors present. save your "phonebook" data somewhere and Make sure your phone's battery is fully charged if not plug the charger in and proceed. NB: interrupting this process might render your phone useless. So, be careful.

To format press *#7370# it will prompt you for security code, enter it and the phone will reboot. Your phone will be reset to "factory settings."

The trick is Switch off the phone.
Hold down the following three buttons: Green (call answer) button, * button, and ‘3′ button
While holding these buttons, press the power button and switch on the phone
When the message ‘Formatting’ appears on the screen, release all of the buttons...

it will refresh your phone, reformat it and reinstall all ur apllication

12345 is a standard code and 00000, but if you change it and you have forgotten your unlock code, you'll just have to reformat it

key combination which is used to hard reset the phone (similar to
#*7370). It is useful in some cases, for example when the phone cannot
reboot.

The trick is Switch off the phone.
Hold down the following three buttons: Green (call answer) button, * button, and ‘3′ button
While holding these buttons, press the power button and switch on the phone
When the message ‘Formatting’ appears on the screen, release all of the buttons...reformatting your phone will delete all your data and also will restore all the defaults of your phone, and any corrupted application will be reinstalled, but if the formating doesn't work, you'll just have to re flash it, the safe way is to go to a near repair shop of your phone and have then to re flash your phone,

1. Blank screen phone unable to reboot.2. Phone only able to boot-up to "Nokia" word screen.3. Install some program but not able to uninstall it after that.4. Error messages such as "Child Installer" keeps popping-up.

Do a Full phone formatting on your 6670! as steps below,

1. Make sure you have at least 3/4 charge of battery power left.2. Backup your contacts list and personal files to MMC memory card.3. Switch-off your 6670phone.4. Press and hold 3 keys;Green dial key, * (star key) & no. 3 key and then press the power on/off to swtich on the 6600 phone.

Remember, do not let go all of the keys and hold keys until you see a NOKIA turns to white screen LCD!

5. After a few minutes when the Full phone formatting completed, your 6670 will back to original system and factory settting.

All apps installed & not of the phones' default will be lost. If you did a backup on your mmc, you can restore it back to the C drive again.

but still you have the prob. Contact Re-tailergo to the Cellphone Shop nearby and try to re-program your mobile or Hardware...